DJB
Well the are lighter in weight for the same size cut and more compact, meaning you can fit them on smaller trailers and get in and out of tighter areas on a property. Being more compact also means you can get closer to things resalting in less weedeating. Becuse you are not stuck on top of a mower you can transfer your weight around to cut steeper inclines or duck down to cut under trees and also cut feather into a trees low having branches where you would otherwise need to weedeat. If you get the mower stuck you can get off and help it out easier if your by yourself, try that with a Z. You can also pick up trash or more hoses or garbage cans what evers in your way with never getting off the mower. Hopes this helps but be ready to spend some money.